How to gather after a divert?

### In Ink, how can I gather after a divert?

I am writing a quiz that is comprised of the following two ink files.

The problem is that I cannot work out how to get Ink to allow me to _choose another round_ after completing the first one.

**quiz-main.ink**
```
INCLUDE quiz-rounds.ink

Welcome to the quiz!
-> ChooseRound

=== ChooseRound ===
Please choose a round!
* Round 1
-> Round1
* Round 2
-> Round2
* Round 3
-> Round3

- Bye now. // The ink never flows here :(
-> END
```

**quiz-rounds.ink**
```
=== Round1===
Welcome to Round 1. Which do you prefer: Puppies or Kittens?
* Puppies
~correct()
-> Won
* Kittens
-> Lost

=== function correct() ===
{~Correct|Well done|Go you}!

=== Won ===
Well done, you completed this round!
-> ChooseRound // Ink cannot find this knot :(
// And if I remove the divert instead, it complains about the loose end

=== Lost ===
Wrong, try again next time!
-> ChooseRound // Ink cannot find this knot :(
// And if I remove the divert instead, it complains about the loose end
```

Of course the problem is that in quiz-rounds.ink, Ink does not know what `ChooseRound` refers to. I tried including quiz-main.ink into quiz-rounds.ink, but that of course leads to a circular dependency, which Ink does not like either.

Separating content across files seems like a pretty standard thing to want to do, so how can this be solved, please?